package com.dong.designPattern.proxy;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

public class Test {

    public static void main(String[] args) {
        int i = 0;
        i++;

        HashMap<Object, Object> map = new HashMap<>();
        Map<Object, Object> map1 = Collections.synchronizedMap(map);
    }
}
